/*
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at 
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *  
 */

using System;
using java = biz.ritter.javapi;

namespace org.apache.commons.collections
{

    /**
     * Defines a functor interface implemented by classes that do something.
     * <p>
     * A <code>Closure</code> represents a block of code which is executed from
     * inside some block, function or iteration. It operates an input object.
     * <p>
     * Standard implementations of common closures are provided by
     * {@link ClosureUtils}. These include method invokation and for/while loops.
     *  
     * @since Commons Collections 1.0
     * @version $Revision$ $Date$
     *
     * @author James Strachan
     * @author Nicola Ken Barozzi
     * @author Stephen Colebourne
     */
    public interface Closure
    {

        /**
         * Performs an action on the specified input object.
         *
         * @param input  the input to execute on
         * @throws ClassCastException (runtime) if the input is the wrong class
         * @throws IllegalArgumentException (runtime) if the input is invalid
         * @throws FunctorException (runtime) if any other error occurs
         */
        void execute(Object input);

    }
}